February 2012 19 – 315
PWT The PWT Phase Angle Testing Unit serves to evaluate the signal amplitude and quality as well as the
position and width of the reference mark.
--> See ”PWT 10/17/18 test unit” on page 30 – 566.
Using the PWT instead of the PWM 9 has advantages and disadvantages.
Advantages:
Small, lightweight device
Easy handling
Disadvantages:
The PWT has an input but no output. This means that it cannot be connected in series between
encoder and control.
Thus, the motor encoder can hardly be checked at "operating speed".
The motor shaft or the spindle must be turned manually.
Photo: Example of a recording with the PWT 18:
A linear encoder (1 Vpp) is connected to the PWT 18 with the signal cable and the adapter connector
ID 324555-01. The axis is traversed using a motor encoder with indirect path measurement.
(See ”Position measurement via motor encoder (indirect position measurement)” on page 19 – 317.)
Every PWT is delivered with operating instructions.
A detailed explanation of the device is part of our training courses on measuring systems.
We recommend that you participate in a HEIDENHAIN service training course so that you can
use the PWT correctly and effectively.
Contact HEIDENHAIN Traunreut or your regional agency.
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